It will include all updates from the Korean version from 3.5 to 4.1.2. It will NOT include Sorceress Emilia (that name may change) as we've previously announced. I also want to point out that we have received the next major update and are working to put it on our Montoro Test Server as we speak. We intend to release this to a limited closed beta in the near future.1

The few tit-bits he revealed so far are mostly features of v3.5, so I will link them to existing feature articles in sGE below. Costumes are linked to the respective screenshots.

Summon Friend Scroll available in Feso Shop for 10k feso each. See Scroll of Destiny.